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B.F. Skinner never let his pigeons starve; they all made it out alright.
.F.斯金纳从不让他的鸽子挨饿,所以它们都活得挺好
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B.F. Skinner never let his pigeons starve; they all made it out alright.
.F.斯金纳从不让他的鸽子挨饿,所以它们都活得挺好
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